Compensating pump for pneumatic vehicle-tires



H. C. SCHROEDER.

COMPENSATING PUMP FOR PNEUMATIC VEHICLE TIRES.

APPLICATION FILED JUNE 20. I918.

1,3 1 1 ,533. Patented July 29, 1919.

HARRY O. SCHNEIDER, 0F BERKELEY, CALIFORNIA.

GOHPENBA'I'ING PUMP FOR- PNEUMAI'IG VEHICLE-TIRES.

T 0 all whom it may concern.-

Be it known that I, HARRY O. Sonnononn, citizen of the United States,residing at Berkeley, in the county of Alameda and State of California,have invented certain new and useful Im rovements in Com ensating Pumpsfor neumatic Vehicleires, of which the following is a specification.

My invention is a compensating pump for pneumatic vehicle tires and isan improvement on m fiump disclosed in my application Seria 0. 210,193,filed January 3, 1918.

The invention will be hereinafter fully set forth and particularlypointed out in the claims.

Referrin to the drawing, in which the reference 0 aracters correspond toand indicate the same parts as those of the specification:

Figure 1 is a longitudinal section of one form of my improved pump.

Fig. 2 is a longitudinal section of another form of m im roved pump.

In the rawmg 1 indicates the valve of 'a pneumatic tire and 2 the captherefor. The ca is formed with an internally threads cap 3 which screwson the outer end of the valve 1, and with an external thread 4 on itsinner end on which a nut 5 screws against the felly of the wheel onwhich the tire is mounted. The cap is formed with a partition 6 adjacentthe cap 3 and with a artition 7 intermediate the partition 6 an the headof the ca The partition 7 dividing the cap into a c amber 8 and thepartitions 7 and 6 dividing the cap into a chamber 9. The partition isprovided with a port 10 extending transversely therethrough, which ortestablishes communication between t e' chambers 8 and 9. A rubber sack11 extends through the port 10 into the chambers 8 and 9 and is cementedto the walls of the chamber 8 while it is free to expand and contractwithinthe chamber 9, the partition 7 dividing the sack intotwo cham ers12 and 13 respectively within the cap chambers 8 and 9 and the port 10providing fora ort 14 establishin communlcation between t e chambers 12an 13. A liquid such as mercury. is placed within the sack whichoccupies about half of the ex anded sack.

In the fin-m of my invention shown in Fig. 1, the dca 2 is provided withair inlet arts 15 an chamber 9 is provided wit an Specification ofLetters Patent. Patented July 29, 1919.

Application Med .Tune 20, 1918. Serial No. 240,982.

air inlet port 16 extending through partition 6. A check valve 17 isarranged within the port 16 to permit air to enter the chamber 9 and toprevent air from escaping from said chamber throu h ort 16. An an outletport 18 is provide for the chamber 9 which extends through partition 6into the. head of screw cap 3 and communicates with the valve 1. A checkvalve 19 is arranged within the port 18 to ermit air to ass through theit into t e valve 1 an to prevent air rom escaping from valve 1 andentering chamber 9.

In the form of my invention shown in Fig. 2, the sack 11 is cemented tothe walls of the cap chamber 9. A pouch 20 formin an air chamber islocated in the end of t e sack chamber 13 adjacent the partition 6 and atube 21 extends through the sack and the partition from the pouch to thescrew cap 3. Acheck valve is arranged within the tube 22 which opens topermit air to pass from the uch into the cap 3 and into the valve 1. hepartition 6 is rovided with an air inlet port 23 communicating with port21 and a check valve 24 is located therein to admit air through port 21into ouch 20 and to prevent air passing from t e pouch into theatmosphere.

In the form of my invention shown in Fig, 1, the air enters the chamber9 through ports 15 and 16 and pressing against the end of sack chamber13 forces the mercury in the sack up into the vaccum in the sack chamber12. As the wheel rotates the mercury is forced into sack chamber 13 bycentrifugal force, which forms a liquid piston compressin the air inchamber 9 and closing the va vs 17 and preventing the escape of air fromthe chem r 9 through port 1'6, but the air is not compressedsufilclently to open valves 19 and 1. When the wheel strikes a roughplace in the road the reaction of the impact forces the mercury fartherinto the sack chamber 13 which comprewes the air in chamber 9 until it oens the valves 19 and 1, and forces the air through port 18 and valve 1into the tire.

In the form of my invention shown in Fig. 2, the air normally enteringthe pouch 20 through ports23 and 21 fills the pouch and forces the mercuupwardly into the sack chamber 12. As t e wheel rotates more mercury isforced into sack chamber 13- by centrifugal force compressing the pouch20 but not sufiiciently to open valves 22 and 1. When the wheel strikesa rough place in the road the reaction of the impact forces the marcuryfarther into the sack chamber 13 which compresses the air in the pouch20 until it 0 ns valves 22 and 1 and forces the air t rough port 21 andthe valve 1 into the tire.

Having described my invention, I claim as new and desire to secure byLetters Patent:

1. In combination with a pneumatic tire valve, a compensating air pumprovided with a flexible piston operatable y centrifugal force andvibration.

2. In combination with a pneumatic tire valve, a cap for said valve, anda compensating air pump arran in said cap and rovided with a fiexib egiston operatable y centrifugal force and vi ration.

3. In combination with a tire valve, a ca for said valve, said cap beingformed wit a pump chamber, an elastic sack arranged in said chamber, airinlet and outlet means for said chamber, said outlet means communicatingwith said tire valve, and means for permittin a liquid to flow in saidsack to compress the air in said pump chamber into said tire valve.

4. In combination with a tire valve, a cap for the valve, an air chamberin said cap, means for admitting air into said chamber and means forpermitting the air to pass from said chamber into said valve, and aliquid piston for acting upon the air in said air chamber.

5. In combination with a tire valve, a cap for the valve, an air pumparranged within sa d cap for pumping air into said tire valve, salad airpump inclu ing a liquid piston.

6. In combination with a tire valve a cap for the valve, an elastic sackarranged within said cap, said sack bein divided into'twomtercommunicating chamiers, a liquid in said sack, one of said chambersformin a vacuum chamber and the other chain or forming a piston, an airchamber, means for admitting air into said air chamber, and means forpermitting air to be forced therefrom into said tire valve under theinfluence of said piston.

7. In combination with a tire valve, a cap for the valve, a sackarranged within said cap, a liquid in said sack, said sack being dividedinto two intercommunicating chamhers forming a vacuum chamber and apiston, one of said chambers beifi secured to the wall of the cap, anair c amber in said cap, the other sack chamber and piston being looselyarranged and movable in said air chamber, and means for admitting airinto said air chamber and permitting air to be pumped therefrom underthe influence of said piston.

8. In combination with a pneumatic tire valve and a'cap therefor, a tirepump arran (1 in said ca and provided with a flexible piston, an meanswhereby said pump is connected to the valve stem of a tire.

In testimony whereof I affix my signature.

HARRY C. SCHROEDER.

